Automated Geometry and Mesh Updates for Accelerator Shape Optimization
- Simmetrix Inc.
- SLAC National Accelerator Laboratory
This report describes the accomplishments for the DOE Award DE-SC0018715 project titled “Automated Geometry and Mesh Updates for Accelerator Shape Optimization.” The overall objective of this project is to develop tools for and to demonstrate the application of, a fully automated geometry optimization process for the design of electromagnetic accelerator cavities. We utilized an existing electromagnetics simulation suite ACE3P/Omega3P (Omega3P being the particular solver from that suite that is used for eigenvalue computations) and optimization algorithms based on discrete adjoint methods, both of which were developed at Stanford Linear Accelerator Lab (SLAC). In addition, existing Simmetrix tools for mesh generation (MeshSim), geometry modification and query (GeomSim), and user interface tools (SimModeler) formed the starting point for the new capabilities developed. The work performed in this Phase I was to: Allow the user to define design variables that describe the allowable changes to the geometry as it is defined in a CAD model and provide the ability to automatically update the CAD model to reflect changes to the design variables. Compute the necessary geometry-related derivatives for input to the optimization tool (the design velocity field). Perform mesh updates to ensure that the mesh reflects the changes to the CAD geometry and is of good quality, with full support for the curved meshes needed by ACE3P. Integrate the geometry and mesh update capabilities into the existing design optimization loop using ACE3P and demonstrate the capabilities on realistic problems. The itemized objectives factor into an overall workflow that starts with the specification of the design variables, and the corresponding model modifications they describe, interactively in SimModeler. That information is then used to compute the design velocity field, which is written into the input deck –together with the generated finite element mesh—and provided to ACE3P. The solution of the finite element analysis is fed into the optimization tool, which in turn directs adjustments to the geometry by specifying new values for the design parameters. The geometry is accordingly adjusted, and together with a new finite element mesh and design velocities, the cycle continues. During this Phase I project the developed tools were limited in scope (options for design choices) and efficiency (file transfer instead of tight coupling between Simmetrix’ tools and ACE3P) to demonstrate the feasibility of the work planned for Phase II.
- Research Organization:
- Simmetrix, Inc., Clifton Park, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- SC0018715
- OSTI ID:
- 1506980
- Type / Phase:
- SBIR (Phase I)
- Report Number(s):
- DOE-SIM-018715
- Country of Publication:
- United States
- Language:
- English
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